/Engine/Source/Runtime/Engine/Classes/Sound/SoundBase.h
Returns whether the sound has cooked analysis data (e.g. FFT or envelope following data) and returns sound waves which have cooked data.
virtual bool GetSoundWavesWithCookedAnalysisData ( [TArray](API\Runtime\Core\Containers\TArray)< [USoundWave](API\Runtime\Engine\Sound\USoundWave) * > & OutSoundWaves )